Aerial Application Methods for Increasing Spray Deposition on Wheat Heads

Fritz, Bradley K.; Kirk, I. W.; Hoffmann, W. C.; Martín, Daniel; Hofman, Vern; Hollingsworth, C.; McMullen, Marcia; Halley, Scott

doi:10.13031/2013.20453

Cited by 27 publications

(8 citation statements)

References 9 publications

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“…It indicated that with increased droplet size, the droplet deposition rate in the upper and lower rice canopy were increased in the target area. Similar to other studies [16,41], the reason for the droplet deposition results difference could be that the droplets with smaller size are more likely to drift outside the target area under the influence of the environmental wind, and the droplets with larger size which are less affected by the environmental wind due to the mass of the droplet are more likely to deposit in the target area.…”

Section: Droplet Deposition Penetrationsupporting

confidence: 73%

Effect of Droplet Size Parameters on Droplet Deposition and Drift of Aerial Spraying by Using Plant Protection UAV

et al. 2020

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In the field of pesticide spraying, droplet size is one of the most important factors affecting droplet deposition and drift. In order to study the effect of different droplet size parameters on droplet deposition distribution and drift of aerial spraying by using plant protection UAV, an aerial spraying test with the same spraying rate and different size droplets in rice canopy was carried out by using multi-rotor unmanned aerial vehicles (UAV) and four TEEJET nozzles with different orifice sizes (these droplets with a volume median diameter (VMD) of 95.21, 121.43, 147.28, and 185.09 μm, respectively), and the deposition distribution and penetration of droplets in the target area and the drift distribution of droplets in the non-target area were compared and analyzed. The results showed that the deposition distribution and penetration of droplets in the target area and the drift distribution of droplets in the non-target area were influenced by the droplet size. The droplet deposition rate in the upper and lower rice canopies were increased in the target area with the increase of droplet size. The penetration results of droplets also increased with the increase of droplet size, and that of droplets with a VMD of 185.09 μm was the best, reaching 38.13%. The average values of the cumulative drift rate of droplets in the rice canopy in the four tests were 73.87%, 50.26%, 35.91%, and 23.06%, respectively, and the cumulative drift rate and the drift distance of droplets decreased with the increase of droplet size, which indicated that the increase of droplet size can effectively reduce droplet drift. It demonstrated that the droplet size is one of the most important factors affecting droplet deposition and drift for pesticide spraying by plant protection UAV, and for the application of plant protection UAV with extra-low volume spraying, the use of droplets with VMD less than 160 μm should be avoided and a more than 10 m buffer zone should be considered downwind of the spraying field to avoid drug damage caused by pesticide drift. The results have fully revealed the effect of droplet size parameters on droplet deposition and drift of aerial spraying. Moreover, the influence of the wind field below the rotors on the distribution of droplet deposition was surmised and analyzed from the perspective of plant protection UAV. It is important for optimizing the droplet parameters of aerial spraying, increasing the spraying efficiency, and realizing precision agricultural aviation spray.

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Section: Droplet Deposition Penetrationsupporting

confidence: 73%

Effect of Droplet Size Parameters on Droplet Deposition and Drift of Aerial Spraying by Using Plant Protection UAV

et al. 2020

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“…Though the 0.8 l • min −1 nozzles had half of the volume rate of the 1.6 l • min −1 nozzles, they resulted in a higher coverage relative to their application rate (Table 1). This suggests that flow rate volume has a linear relationship with application volume rate, and lower volumes can result in higher coverage as has been observed in prior studies (Fritz et al 2005). MW had the highest coverage percentages, where WSP collectors resulted in a 2% decrease, KK collectors a 35% decrease in coverage and MIA collectors showed a 77% decrease in coverage compared to MWs across nozzle types.…”

Section: Discussionsupporting

confidence: 69%

Journal of Plant Protection Research

Ferguson,

Hewitt,

O’Donnell

et al. 2020

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“…2021 enhance the spray deposition when the vegetation indices increase, owing to the advancement in the phenological stage of the crop (Martins et al, 2021). Comparing different application rates, reports of increased deposition with higher (Derksen et al, 2008) and lower rates (Alves et al, 2020) were found, but the latter was also related with an increased droplet size (Fritz et al, 2006). The application rate should be regulated according to the crop foliage spray retention capacity; exceeding this level may result in runoff from the upper third of the field, with part of the spray still retaining in the lower third (Souza et al, 2020) or in the runoff to soil (Cunha et al, 2011b).…”

Section: Introductionmentioning

confidence: 99%

Multivariate Analysis Applied to Spray Deposition in Ground Application of Phytosanitary Products in Coffee Plants

et al. 2021

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An adequate combination of factors involved in the technology used for phytosanitary product application contributes to an efficient spray deposition on the target. The objective of this study was to use multivariate analysis to characterize the magnitude of effects and the order of influence of three factors that interfere with the quality of phytosanitary product application in coffee plants. An entirely randomized design was adopted, with four repetitions, using a 2 × 2 × 3 factorial scheme, with two classes of droplets quality (fine and coarse), two application rates (250 and 400 L ha -1 ), and the use of adjuvants (with no adjuvant or with Fighter ® and Aureo ® adjuvants). The quality of the application was determined by jointly analyzing the spray deposition on three thirds of leaves, in their internal and external layers, the runoff to soil, coverage, droplet density, relative amplitude, and the volumetric median diameter. The results underwent analysis of variance (ANOVA) to measure the effect sizes (η 2 ). After testing the assumptions of multivariate analysis, clustering and principal component analyses were performed. The class of droplets was found to be the most influential factor in the quality of the phytosanitary product application (spray deposition and runoff to soil). When focusing on spray deposition on leaves, the second-most influential factor was the application rate and the relation between the application rate and the adjuvants. For the other variables, the second-most influential factor was the application rate.

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Aerial Application Methods for Increasing Spray Deposition on Wheat Heads

Cited by 27 publications

References 9 publications

Effect of Droplet Size Parameters on Droplet Deposition and Drift of Aerial Spraying by Using Plant Protection UAV

Effect of Droplet Size Parameters on Droplet Deposition and Drift of Aerial Spraying by Using Plant Protection UAV

Journal of Plant Protection Research

Multivariate Analysis Applied to Spray Deposition in Ground Application of Phytosanitary Products in Coffee Plants

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